Patent · US Expired

Cation exchange membrane with high equivalent weight component

US4401711A · kind A · utility

4Cited by

15References

8Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Raimund H. Silva · Wilmington, US
Roger A. Smith · Kennett Square, US

Key dates

Filing date	Nov 2, 1981
Grant date	Aug 30, 1983
Priority date	—
Expiry date	Nov 2, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/3854
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

Composite fluorocarbon cation exchange membrane having at least two layers of fluorinated polymer containing pendant side chains with sulfonyl groups wherein the equivalent weight of one such layer differs from the adjacent layer by at least 100.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.